M3.4 Earthquake 122 km S of Yakutat, Alaska — September 20, 2026
2026-09-20 18:19:39 UTC (1 hour ago) · approx. 9:19 AM UTC-9 local
On September 20, 2026 at 18:19 UTC, a magnitude 3.4 shallow crustal earthquake struck 122 km S of Yakutat, Alaska, at a depth of 5.0 km and coordinates 58.4600°, -139.3810°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 134 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-139.3810°E
Technical Information
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Common Questions
How strong was the magnitude 3.4 earthquake near Yakutat, Alaska?
The magnitude 3.4 earthquake that struck 122 km S of Yakutat, Alaska on September 20, 2026 at 18:19 UTC had a depth of 5.0 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: aka2026srikrm). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 20, 2026). M3.4 Earthquake 122 km S of Yakutat, Alaska — September 20, 2026. Retrieved September 20, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026srikrm/